variable = "common"
$golbalVal = "golbalVal"
Const = "I'm const"

def fun
   puts "no modify:" 
   puts $golbalVal
   puts Const
   puts "modify after:" 
   $golbalVal = "modify golbal value!"
#    Const = "I'm modify const!"
   puts $golbalVal
#    puts Const
#    puts variable
end
fun() 
